Gseli



L. LWY

MANDREL UPSETTING PRESS Filed March 25, 1926 Patented Nov. 13, 1928.

um'rso STATES- PATENT OFFICE.

mmwm aw, or nussntnonr, Grimm, 'assmnon To scnnonmann AKTIEN- esntnscnm, ornussntnoar, GERMANY, a coaroaarron or GERMANY.

umnnnt ursnr'rnio PRESS.

Application fled larch 25, 1926, Serial No. 97,252,' and in Germany April 1, 1926.

\ My invention-relates to mandrel upsetting In the rolling of tubes by thesoFcalled Per rins process the mandrelstsed therein, due. to the pressure of the rolls, have their diam-" eter reduced, while in axial direction they .10 are lengthened, the mandrels also losing their cylindrical shape. To enable these mandrels to ,be used over again, their original diameter must be restored, and to this end- -they--are upset in axial direction in hydrauhc l presses. I-Ieretofore, the mandrels have'been upset in cylindrical chill moulds made of two parts; which means,'of course, that for. each diameter a special mould is required. This in turn means a considerable outlay for a.- large number. oflmoulds, not to megntionthe time required for exchanging the molds; The present invention has for its object to eliminate these great drawbacks, and I accomplish this by providing a single mouldeor matrix in which are rovided three, four or more concentric are -shaped members, which are radially adjustable. In this manner, a single mould or matrix can be employed for any de sired number of mandrels having various diameters. Moreover; every mandrel can be exactly centrall positioned within the mould or matrix, sot at the press plunger is sub jected only to central strains' For a better understanding of my invention, I refer to the following detailed description with reference to the appended drawing, in which I have illustrated one embodiment of my invention by way of example, and in which Fig. 1 is a side elevation of the closed mould, the, means for varying the position of the a rch sha d members being provided on the outside, t e figure also showing the projecting ends of the mandrel; Fig. 2 is a crosssection of the divided closed mould, the archshaped members being shown .drawn apart from each other for the upsetting of a. mandrel of very large diameter; Fig. 3 is a similar cross-section as Fig. 2 showing the archshaped members pushed toward each other for the upsetting of a mandrel of medium diameter. I i

a is the divided casing of the mould, which is closed by hydraulic cylinders (not shown). Within the casing a are mounted four archshaped members I), which may be simulthe scope of my invention.

through sprocket-wheels a, worms d, wormwheels 6 and screw-spindles f. By this mech- 'anism, the four arch-shaped members 6 can be uniformly moved from the center of the casing, the said member constituting the cylindrical mould for the mandrels g to be subjected to the upsetting operation. The

arch-shaped members are shapedin such a waythat after. the upsettingoperation, they I contact with the mandrel each along two lines. As experience has shown, these eight contact ,lines of the arch-shaped members I) with the;

mandrel g sufiice, so that the mandrel will be perfectly round. V Y

The operation is as follows:

After the said arch-shaped members I), by

means of the sprocket-wheels c, worms cl,-

worm-wheels e and screw-spindles fhave been ad usted to the correct diameter of the mandrel, the-upper halfof the casing a is lifted, and the hot mandrel g to be upset is placed into the lower half of the casing so that the one end bears against the abutment 71, (Fig. 1). Now, by the application of hydraulic pressure, the upper half of the caslng 1s pressed onto the lower half, whereupon the pres's-plungerz' (Fig. 1) is moved toward the left in Fig. 1 in the direction of the arrow, upsetting the mandrel in axial direction until its surface everywhere bears on the contact lines of the previously positioned arch-shaped membersb. After the upsetting operation has been completed, the press-plunger i is withdrawn, the upper half of casing a is lifted, and the mandrel is removed from the lower half of the casing, and a fresh mandrel can now be placed therein. 1

While I. have thus described my invention in detail, I-do not,-of course, limit myself to the details of construction as shown, since various modifications will easily suggest themselves to those skilled in the art within I claim:

1. In a mandrel upsetting press, the combination with a casing, of a'plurality of movable arcuate members concentrically positioned in said, casing, means for adjusting said members relative to each other, means for upsetting mandrel positioned within said arcuate members, and mechanism for rigidly maintaining said movable arcuate members in position during said upsetting.

2. In a mandrel upsetting press, the combination with a casing, of a plurality of adjustable'arcuate members concentrically positioned in said casing and adapted to bear against the mandrel, means for uniformly moving said members toward-and away from the central longitudinal axis of said casing, means for upsetting a mandrel positioned within said arcuate members, and mechanism for rigidly maintaining said movable arcuate members in position during said upsetting.

3. In a mandrel upsetting press, the combination with a casing, of a plurality of ad-' justable arcuatemembers concentrically positioned in said casing-and adapted to each contact with the mandrel along two lines, means for simultaneously moving said members toward and away 'fromth'e central longitudinal axis of said casing, means for upsetting a mandrel positioned within said arcuate members, and mechanism for rigidly maintaining said movable arcuate members in position during said upsetting.

4. In a mandrel upsetting press, the combination with a casing comprising a lower and upper half, 'of a plurality of adjustable arcuate members concentrically positioned in v said casing and adapted to make contact with the. mandrel along two or more lines, man

arcuate'members in position uring said up;

setting;

5. 111a mandrel upsetting press, the'combination with a casing, of four movable arcuate members concentrically disposed in said casing and adapted to make contact with the mandrel with their inner ends, means for uniformly adjusting said members relative to the central longitudinal axis of said casing, said means comprising screw-spindles cooperating with said members and carrying worm-wheels, worms meshing with said worm-wheels, spindles carrying said worms, and a manually operated wheel for rotating said spindleymeans for upsetting a mandrel positioned within said arcuate members, and mechanism for rigidly maintaining said movable arcuate members in position during said upsetting.

In testimony whereof I affix my signature.

.- LUDWIG LOWY 

